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(No Model.)

W. L. JUDSON. MEGHANIGAL MOVEMENT.

2 Sheets-Sheet 1.

Patented May 7. 1889.

avwcwfoz (No Model.) 2 Sheets-Sheet 2..

W. L. JUDSON.

MECHANICAL MOVEMENT. No. 402,674. Patented May 7, 1889.,

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UNITED, STATES PATENT"? OFFIC WHITOOMB L. JUDSON, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO THE JUDSON PNEUMATIC RAILWAY COMPANY, OF .SIAME PLACE.

MECHANICAL MOVEMENT.

srncrrrcn'rron forming part of Letters Patent No; 402,674, dated May 7, 1889.

Application filed November 16, 1888. Been No. 290,879. at model-l To all whom it may concern:

Be it known that I, WHITCO-MB L. J UDSON, acit-izen of the United States, and a resident of the city of Minneapolis, county of Hennepin, State of Minnesota, have invented a certain new and useful Mechanical Movement,- of which the following is a specification, reference being had to the accompanying drawings. My invention is especially designed for use in connection with a street-railway system, but is capable of universal application wherever it is desired to turn a rotary into rectilinear motion.

I 5 It consists of the construction hereinafter fully described, and particularly pointed out in the claims. In the drawings, like letters referring to like parts throughout, Figure 1 is a side ele- 2o vation of my preferred construction; Fig. 2, a cross-section or end view of the same; Fig. 3, a plan of the driving-drum and friction-wheels .partly detached from their supporting-frame. Fig. 4 is a side elevation of a modified con- 2 5 struction; Fig. 5, an end View'or cross-section ofthe construction shown in Fig. 4; Fig. 6, a plan of the driving-drums and friction-wheel detached from their supporting-frames, and Fig. 7 is a plan of a part of the supportingframe in which the friction-wheel is mounted. In the construction shown in Figs. 1, 2, and 3 I use a single driving drum orshaft and a pair of traveling friction-wheels engaging therewith at an angle to its axis- In the construction shown in Figs. 4 to 7,

inclusive, I use a pair of parallel drivingdrums, continuously revolving in the same direction, and a single traveling frictionwheel engaging with both drums at an angle to their axes.

o If the friction wheel'or wheels are placed at a right angle to the driving drum or drums, they will not travel lengthwise thereof. If they take any other than a position at right angles to the drivingdrums and the parallelism of their axesbe preserved, they will travel in one direction or the other along the driving drum or drums.

Referring now to the various figures, I have shown themotion as applied to reciprocate a small car or carriage on a definite track-- such, for example, as might be used in a planing-machine, a saw-mil], or other machineswherein areciprocating motion might be desired- 1 I 1 1 5 A isa driving-drum in fixed supports B.

- As shown, these fixed supports are cross-bars secured to upright sides of the shaft. 4

D are girders mounted on the tops of the vertical posts, and E are rails bolted to the girders D. F is a small car or carriage whose wheels rest on the rails E. *To this car is secured a spider or yoke, G, provided at its outer extremities with circular rims G G". These rims are provided on their outer surfaces with inwardly-projecting flanges g. H are revoluble heads mounted in the rims posts 0 on the opposite .G G and provided with journal-bearings h I and plates h overlapping the flanges g. 7o

K are traveling friction-wheels mounted in the revoluble heads H.

L is a rock-shaft on the car F, and is provided with cranks L and L", opposite to each other. From-these cranks extend connections la/nd Z, respectively, to the revoluble heads M is a hand-lever on the rock-shaft L. M r is a notched segment adjacent thereto.

M" is a pawl on the lever M, for engaging with the notched segment M By means of the lever M and its connections the revoluble heads H may be moved in opposite directions in the supporting-rims G and G thus varying the angle of the friction-wheels K to the driving-shaft A, while preserving the parallelism of the axes and the peripheries of said wheels.

' As shown, the yoke or spiderG is a curved spring-bar. For, the purpose of obtaining a variable traction suitable to the load, a rightand-left screw, N, passes through corresponding nuts on the outer ends of the yoke G and is provided with a hand-lever, N, extending within reach of the operator of the car. N" is a notched segment adjacent to the lever N.

N is a pawl on the lever N for engaging with thesegment N". 1

Referring now to the modification shown in 2 ,aoae'm Figs. 4, 5, 6, and 7, P P area pair of parallel driving-drums similar to the driving-drum A, arranged adjacent to each other'and continuously revolving in the same direction, Q is a swiveled yoke mounted on the car F, provided with the journal-bcaring q. R is a single traveling friction-wheel mounted in the bearings q. S is a segment-plate provided with a curved groove, S, secured to a part of the car adjacent to the swiveled yoke Q. T is a crosshead or movable block mounted in the groove S. U is a hand-lever fulcrumed in the block T intermediate its extremities, andpivotally connected at its inner end to the yoke Q. V is a coiled spring encircling the vertical shaft of the yoke intermediate the car-frame, or a boss, W, on the same, and the bifurcated arms of the yoke.

It is evident that by the lever U and its connections the yoke may be swung through the arc of a circle and the friction-wheel be made to take any desired angle to the parallel driving-drums; hence the car maybe made to stand still or to travel in either direction lengthwise of the driving-drums at a variable speed.

The advantage of using one device of one kind opposed to twoof the other is thatthereby a wedging or crowding action is secured, giving far better frictional contact and a resultant of forces substantially in a straight.

line without other limiting-guides. The driving-drums may be driven in .any suitable way from a source of power.

In the drawings the drum or drums have been shown as the propeller, and the friction wheel or wheels as the traveler; but it will be readily understood that the reverse ar rangement will work. A rectilinear motion of the frictionavheels will impart a rotary motion to the drums; or, if the friction-wheels be mounted in fixed supports and made to rotate and the drum or drums in movable supports, the former being at an angle to the axis of the latter, the drums will be made to travel in a right line. 'In other words, the wheels and the drums are interchangeably propellers or travelers. It should alsobe noted that the power is convertible into speed or the speed into power at will. If the propeller be driven with uniform power and "the positive thread.

speed, it'will take effect on the traveler more in speed or-more in power, according to the angle of the wheel or wheels to the drum or drums, which angle is variable at will. In

other words, the construction is practically Y that of a screw and nuts of a pitch variable at will, frictional contact taking the place of less screws, and the wheels are nuts following imaginary lines thereon by frictional contact, the pitch of which and the direction of which (from right to left) are variable at will,

What I claim, and desire to secure by Letters Patent of the United States, is as follows: 1. The combination of cylindrical-drum and friction-wheel devices capable of angular engagement with each other, there being one device of one kind and two of the other, and the angles of engagement variable at will, whereby the rotation of the device or' devices of one kind gives a rectilinear movement, the

The drums are thread-- speed of which is proportionate to the angle j of engagement to such of the other as are ongaged thereby, substantially as described.

2. The combination of cylindrical-drum and friction-wheel devices capable of angular engagement with each other, there being one device of one kind and two of the other, such as are employed of one kind being mounted in fixed, and such as are employed of. the otherin movable, supportsjsubstanw tially as described.

3. The combination, with a cylindrical driving-drum, of twofriction-wheels capable of angular engagement therewith, the said wheels being mounted in movable bearings, whereby their angles of engagement with said drum may be varied, substantially as described. f

.4. The combination,with a cylindrical driving-drum mounted in fixed supports, of two friction-wheels capable of angular engagement therewith on opposite sides, said wheels being mounted in a movable support and in movable hearings in said support, substantially as described.

"WHITCOMB L. JUDSON.

In presence of- JAS. F. WILLIAMSON, EMMA ELMORE. 

